Electrically dead CB360

[cosworth]

So I wheeled the 360 into the shop from storage today. I wanted to tackle some of the basics with it to see if it's worth doing up.

Turn the key and nothing. Switch checks out. Continuity until I get to the rectifier. Now, I'm colour blind so me and wiring diagrams is a spectator sport. I should have .500 on the diode setting of the multimeter between pink and red and yellow and green, but not the reverse correct?

Will a dead rectifier render the CB comatose?

 

[Sonreir]

Uncommon, but it could happen. Generally when a rectifier goes bad it prevents the battery from charging, but if something is really wrong, it may allow current to flow in the opposite direction and will drain the battery.

Have you checked the battery for a voltage reading?

 

[cosworth]

Well that's how I'm tracing the current. With a full charged, new battery. I'm just tracing faults.

 

[Sonreir]

So you've measured voltage at the battery + terminal, the solenoid, and at the ignition switch?

 

[cosworth]

I've got 12v at the main fuse. Nothing at the key switch connector. The short connector that comes off the solenoid to the main harness that splits into two 14g wires at the connector only has continuity to the main fuse. I'm trying to see if the voltage impasse is the rectifier since the second 12v circuit goes to the rectifier before going anywhere else. The other circuit of course going to the main fuse.

I have lots of yamaha parts around to play with but don't have a spare Honda rectifier.

 

[Sonreir]

The rectifier is part of a separate circuit, so the only way it would interfere with the power on the whole bike is if it drained the battery.

On the 360s, power goes from battery, to solenoid, to main fuse, to ignition switch. If you have power at the main fuse, but not at the ignition switch, you problem is there.

 

[cosworth]

I'll see what kind of continuity there is between the main fuse plug and the switch plug.

Still pretty convinced the rectifier was the reason this was parked. Testing the rectifier, the + a c - method showed diode on only one path. The break between switch and main fuse is next on the list.

I really appreciate the help Sonreir. As much as I fancy myself a builder/fabricator, I second guess and bow to others' experience when it comes to any wires that have colours on them.

 

[Sonreir]

Rectifier may indeed be bad, but that's just another problem to work out and doesn't have much to do with why the bike won't turn on with a good battery. We can get to that part next.

 

[cosworth]

Oh and btw it's red. Not blue.

 

[cosworth]

Well, made some progress. At least got the speedo lights and tach lights on. The dry corrosion throughout is impressive. If I can get neutral light, spark and horn going that circuit should get me rolling on the rest.


It's hard to wake bikes up sometimes.

 

[Barkingmadspeedshop]

all I could think of

 

[cosworth]

It's funny but that's the name of my alarm on the iPhone.